3 letters

act ∙

4 letters

acta ∙ actg Acth acts ∙ actu

5 letters

acted ∙ actin ∙ acton ∙ actor ∙ Actos actus

6 letters

actaea actant ∙ Actcom Acteon actiad actian actify actine acting ∙ actins ∙ action ∙ actium Activa active ∙ actons ∙ actors ∙ actory actual ∙ acture ∙

7 letters

actable ∙ Actaeon actants ∙ actinal ∙ Actinex actings ∙ actinia ∙ actinic ∙ actinon ∙ actions ∙ actious Actives ∙ Activex activin actless actorly ∙ actress ∙ Actuals ∙ actuary ∙ actuate ∙ actuose actures ∙

8 letters

Actidium actifier actigall Actimoxi Actinaut actiniae ∙ actinian ∙ actinias ∙ actinide ∙ actinine actinism ∙ actinium ∙ actinoid ∙ actinons ∙ actinost actinula actional actioned ∙ actioner ∙ actiones Activase activate ∙ actively ∙ Activent activise ∙ Activism ∙ Activist ∙ activity ∙ activize ∙ actomere actorish ∙ actressy ∙ actually ∙ actuated ∙ actuates ∙ actuator ∙ actutate

9 letters

actinally ∙ actinians ∙ actinical actinides ∙ Actinidia actinisms ∙ actiniums ∙ actinoida actinoids ∙ actinopod ∙ Actinosts Actinotus actinozoa actinulae ActionAid actionary actioners ∙ actioning ∙ Actionism actionist ∙ actionize Actiornis actipylea activable activated ∙ activates ∙ activator ∙ activised ∙ activises ∙ activisms ∙ activists ∙ activital activized ∙ activizes ∙ actograph actophile actophily actorship actresses ∙ actualise ∙ actualism actualist ∙ actualite ∙ actuality ∙ actualize ∙ actuarial ∙ actuarian Actuaries ∙ actuarius actuating ∙ actuation ∙ actuators ∙

10 letters

actability ∙ actaeaceae actiniaria actiniform ∙ actinistia actinocarp Actinodium actinogram actinoidea actinolite ∙ actinology actinomere ∙ actinonema Actinopoda actinopods ∙ actinosoma actinosome actinozoal actinozoan ∙ actinozoon Actionable ∙ actionably ∙ actionists ∙ actionized actionless ∙ activating ∙ activation ∙ activators ∙ activeness ∙ activising ∙ activistic ∙ activities ∙ activizing ∙ actobindin actography actolinkin actomyosin ∙ actophorin actualised ∙ actualises ∙ actualists ∙ Actualites ∙ actualized ∙ actualizes ∙ actualness actuations ∙ acturience

11 letters

actaeonidae Actenicerus actiniarian actinically ∙ actinoblast actinodrome actinogelin actinograph actinolites ∙ actinolitic actinologue actinomeres ∙ actinomeric actinometer ∙ Actinometry ∙ actinomyces ∙ actinomycin ∙ actinophage actinophone actinophore actinophrys actinopteri actinoscopy actinostome actinotoxin actinotrich actionizing Actiosaurus activations ∙ actoclampin actomyosins ∙ actophilous actualising ∙ actualistic Actualities ∙ actualizing ∙ actuarially ∙ actuaryship

12 letters

actabilities ∙ actification actinenchyma actiniferous actinobranch actinocarpic actinocrinid actinocrinus actinography actinologous Actinomadura actinometers ∙ actinometric ∙ actinomorphy ∙ actinomycese actinomycete ∙ actinomycins ∙ actinomycoma actinophagia actinophagic actinophonic actinophryan actinopraxis actinopteran Actinopteryx actinostomal actinotrocha activenesses ∙

13 letters

actinidiaceae actiniochrome actiniomorpha actinobacilli ∙ actinobiology ∙ actinocarpous actinocrinite actinocutitis actinodromous actinographic actinohematin actinometricy actinometries ∙ actinomorphic ∙ actinomycetal actinomycetes ∙ actinomycoses ∙ actinomycosis ∙ actinomycotic ∙ Actinomyxidia actinophorous actinopterous actinotherapy ∙ actinotoxemia actinotrichia actinouranium ∙ actionability actualisation ∙ actualization ∙

14 letters

actiniohematin actinobaccilli Actinobacillus ∙ actinobranchia actinochemical actinocrinidae actinoelectric actinometrical ∙ actinomorphies ∙ actinomorphous ∙ actinomycelial actinomycesous actinomycestal actinomycetoma actinomycetous ∙ actinoneuritis actinophytosis Actinopterygii actinotrichium actinouraniums ∙ actualisations ∙ actualizations ∙

15 letters

actinautography actinobiologies ∙ actinochemistry ∙ actinogonidiate Actinomycetales actinomyxidiida Actinopterygian Actinosphaerium actinotherapies ∙

16 letters

actinautographic actinobacillosis actinobacillotic actinodermatitis actinodielectric Actinomycetaceae actinomycosistic actinopterygious

17 letters

actinoelectricity actinostereoscopy actinotherapeutic

18 letters

actinoelectrically actinotherapeutics

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