2 letters

ax ∙ bx Cx

3 letters

abx arx aux axe ∙ bax box ∙ Btx Cox ∙ dax dbx dex ∙ Dix

4 letters

Ajax alex amex Amox apex ∙ axel ∙ axes ∙ axil ∙ axis ∙ axle ∙ axon ∙ Axum brix Brux ∙ calx ∙ coax ∙ coxa ∙ crux ∙ DivX Doux ∙ doxa doxy ∙

5 letters

Acrux addax ∙ adoxy affix ∙ Alexa ataxy ∙ audax auxin ∙ axial ∙ axile ∙ axiom ∙ axons ∙ borax ∙ botox Boxed ∙ boxer ∙ braxy ∙ buxom ∙ calix ∙ calyx ∙ Capex cimex ∙ codex ∙ comex culex ∙ Detox ∙ Dixie ∙ Donax

6 letters

Adipex adnexa ∙ alexia ∙ alexin ∙ Alexis Amoxil Annexe ∙ anoxia ∙ anoxic ∙ ataxia ∙ atoxic auxins ∙ axenic ∙ axilla ∙ Bayeux Bexley Biloxi Binhex Boxers ∙ boxing ∙ Caudex ∙ Ceefax Celexa cervix ∙ climax ∙ coccyx ∙ convex ∙ cortex ∙ cowpox ∙ Deluxe ∙ dexter ∙ Didrex dioxin ∙

7 letters

abaxial ∙ abraxas ∙ acronyx Activex adaxial ∙ alloxan ∙ Anaprox antefix ∙ anthrax ∙ anxiety ∙ apraxia ∙ apteryx ∙ asexual ∙ auxesis ∙ axolotl ∙ axoneme ∙ bauxite ∙ beeswax ∙ benelux biaxial ∙ biotaxy boxfish ∙ boxlock boxwood ∙ Brixham bruxism ∙ cachexy ∙ Celotex ∙ complex ∙ context ∙ Coolmax coxcomb ∙ coxitis ∙ Cytoxan Decitex Demodex Desoxyn dextrad dextral ∙ dextran ∙ dextrin ∙ digoxin ∙ dioxane ∙ dioxide ∙ Dioxins ∙ distrix ∙

8 letters

Aigamuxa Alkoxide ∙ amplexus ∙ amyotaxy annexins anorexia ∙ anorexic ∙ anoxemia ∙ anthelix ∙ apomixis ∙ apoplexy ∙ appendix ∙ apyrexia ∙ Arimidex asphyxia ∙ ataraxia ∙ auxilium aviatrix ∙ Axanthic axillary ∙ axiology ∙ axolemma ∙ axoplasm ∙ axostyle biconvex ∙ biotaxis biotoxin ∙ bisexual ∙ Bordeaux ∙ cachexia ∙ cacodoxy ∙ carboxyl ∙ carnifex ∙ cathexis ∙ cecopexy cefixime chronaxy ∙ cicatrix ∙ colopexy CompuBox connexin connexon connexus corepexy Cotopaxi coxalgia ∙ Coxiella Coxswain ∙ crucifix ∙ cryopexy Cuxhaven deflexed ∙ detoxify ∙ Dewaxing ∙ dextrans ∙ dextrase dextrins ∙ dextrose ∙ diataxia diplexer ∙ doxapram doxastic ∙ doxology ∙

9 letters

acathexia Admixture ∙ adnexitis aerotaxis ∙ aflatoxin ∙ Alexander ∙ Alexandra alloxuria amphioxus ∙ anthotaxy ∙ antihelix ∙ antitoxic ∙ antitoxin ∙ apostaxis areflexia asterixis asyntaxia atloaxoid autotoxic ∙ autotoxin ∙ auxiliary ∙ auxodrome auxometer ∙ auxotonic ∙ auxotroph ∙ axoaxonic barotaxis basifixed ∙ Bellatrix Biotoxins ∙ Blenoxane cataplexy ∙ celecoxib cetuximab chronaxia chronaxie ∙ chronaxis colpopexy conotoxin convexity ∙ cordopexy coxodynia cystopexy cytotaxis ∙ cytotoxic ∙ cytotoxin ∙ deflexion ∙ defluxion ∙ deoxidize ∙ Dexedrine dexterity ∙ Dextrorse ∙ diazoxide digitoxin ∙ docetaxel doxazosin

10 letters

acroataxia adipopexis admixtures ∙ aflatoxins ∙ Alexanders ∙ alexandria allocortex Alxasaurus ambidexter ∙ ambisexual ∙ amphimixis ∙ amyxorrhea Anaximenes anemotaxis annexation ∙ anorexiant anticlimax ∙ anxiolytic ∙ apexigraph asphyxiant ∙ asphyxiate ∙ ataxiagram auxochrome ∙ auxotrophy ∙ Axillaries ∙ axinomancy ∙ axonopathy axosomatic baroreflex bexarotene bradylexia bruxomania calcipexis Calixtines cephalexin ∙ Chaetotaxy chemotaxis ∙ chickenpox ∙ ciguatoxin circumflex ∙ complexing ∙ complexion ∙ complexity ∙ contextual ∙ Cytotoxins ∙ detoxicate ∙ dextrality ∙ dominatrix ∙ dorsifixed ∙ doxography ∙

11 letters

adnexectomy Alexandrian alexandrine ∙ alexandrite ∙ alexithymia allelotaxis alloxuremia amaxophobia amoxicillin ∙ amoxycillin ∙ amplexicaul ∙ anaphylaxis ∙ Anaximander angiomyxoma anteflexion antianxiety ∙ antioxidant ∙ antixerotic anxiolytics ∙ approximate ∙ archicortex ataxiagraph ataxiameter ataxophobia autotoxemia ∙ auxotrophic ∙ axonography axonometric ∙ axonotmesis biophylaxis bisexuality ∙ carboxamide carboxylase ∙ cardiataxia cardiotoxic ceftriaxone chemiotaxis chemoreflex chiasmapexy Chilomastix chylothorax Coextrusion coxofemoral crucifixion ∙ cyclohexane ∙ cystistaxis cytopharynx deoxidation ∙ deoxyribose ∙ dexrazoxane dextrinosis dextrinuria dextrocular dextropedal doxographer ∙ doxorubicin ∙

12 letters

acroasphyxia alexipharmac alexipharmic ∙ ambidextrous ∙ amniorrhexis amylodextrin anorexigenic ∙ anticathexis antioxidants ∙ apexogenesis Approximates ∙ asphyxiation ∙ ataxiaphasia ataxiophobia atlantoaxial autoxidation ∙ auxanography axodendritic cecofixation colporrhexis colpoxerosis complexation ∙ costoxiphoid cryofixation cytobiotaxis cytophylaxis cytotoxicity ∙ dacryosyrinx deferoxamine deoxycholate deoxygenated ∙ detoxication ∙ dexpanthenol dextrocardia ∙ dextromanual dextrophobia dorsiflexion ∙

13 letters

acetohexamide adenemphraxis ambidexterity ∙ anaphylatoxin anthoxanthins ∙ apexification approximation ∙ archaeopteryx ∙ ataxiadynamia ataxoadynamia autooxidation autotoxicosis auxanographic axiramificate batrachotoxin biotoxicology bronchostaxis bungarotoxins calciphylaxis carboxylation ∙ cardiorrhexis cephalothorax ∙ chemotaxonomy ∙ chlorhexidine ∙ chondromyxoma chronaximeter chronaximetry chronotaraxis ciprofloxacin ∙ cryoextractor cryptoxanthin cycloheximide ∙ decarboxylase ∙ demultiplexer ∙ deoxycytidine deoxygenation ∙ dexamethasone ∙ dextroduction dextrogastria dextroglucose ∙ dextroversion

14 letters

Administratrix ∙ allodoxaphobia andromedotoxin ∙ apexcardiogram arteriorrhexis arytenoidopexy autointoxicant botulismotoxin cardiotoxicity chiropompholyx cholecystopexy coxsackievirus cryoextraction cyclooxygenase demultiplexing detoxification ∙ dextrocularity dextrogyration dextroposition dextrorotatory ∙

15 letters

antianaphylaxis cheiropompholyx chemexfoliation cholohemothorax chromoxylograph ∙ decarboxylation ∙ deoxyhemoglobin Dexfenfluramine dextrosinistral dibenzoxazepine diverticulopexy doxercalciferol

16 letters

apexcardiography autointoxication carboxypeptidase chemoprophylaxis chlordiazepoxide chromoxylography colpohysteropexy counterextension dextrocardiogram dextromethorphan dihydroxyacetone

17 letters

carboxyhemoglobin chylopneumothorax deoxyribonuclease dextroamphetamine

19 letters

deoxyribonucleoside deoxyribonucleotide

20 letters

desoxycorticosterone

21 letters

carboxyhemoglobinemia

22 letters

carboxymethylcellulose deoxyribonucleoprotein

Words with a ∙ are valid Scrabble words (SOWPODS word list)