3 letters

Ius

4 letters

pius

5 letters

Gaius Laius maius ocius alius unius arius prius cuius huius

6 letters

Fabius Decius pocius socius Lucius radius ∙ medius ∙ Vidius modius ∙ Cafius regius ∙ Othius filius Milius Silius illius colius Julius lanius manius Tanius genius ∙ Ennius Nonius Junius impius appius Darius Marius varius serius Sirius lorius lasius Hosius Aetius Citius Altius potius Mutius bavius Ravius obvius Hovius

7 letters

Möbius Otobius virbius Ilybius ericius Celcius Mencius nuncius Marcius gladius ∙ Bledius Quedius Aridius Clodius sardius ∙ Gordius ziffius ∙ congius ∙ sergius Tychius xiphius ziphius pythius Publius Acilius Ovilius Manlius eximius Bromius Dromius Vilnius Limnius piupius ∙ Alypius Babrius Gabrius Varrius spurius Blasius Celsius tarsius Persius Cassius Vossius Boetius pontius nuntius Cyntius Photius Martius tertius ∙ Fortius diutius Flavius Silvius Sylvius servius Pluvius alexius Retzius

8 letters

agelaius Arnobius Polybius sphecius conscius Capucius Pocadius Arcadius adradius inradius exradius schedius dapedius Cocidius aphidius Aphodius acardius Claudius plebeius Velleius Pelagius bacchius ∙ Trichius Trochius Boethius cynthius Vesalius Sibelius aurelius Tiselius orbilius Lucilius Vigilius mamilius Aemilius trollius ∙ Varolius nauplius ∙ merulius dochmius ∙ Ascanius acranius Rhodnius ungenius Silenius splenius ∙ numenius Licinius Cominius Arminius Titinius Stannius Polonius Ausonius Favonius Savonius Eunapius Dalopius Scorpius sicarius vicarius Ligarius triarius talarius Belarius Pilarius Lanarius denarius ∙ senarius ∙ riparius lorarius rorarius turarius octarius cotarius notarius Aquarius Liberius Tiberius Galerius superius alterius ulterius Riverius Nathrius laborius Liborius Honorius risorius putorius proprius milesius Acrisius clausius aloysius ignatius ueratius Horatius Vegetius Arantius quintius Acontius Octavius praevius reduvius Vesuvius

9 letters

Limnebius Ctesibius Caccobius Laccobius Lithobius Hydnobius Grynobius Macrobius Hydrobius Phytobius Rhizobius bathybius ∙ Fabricius patricius missicius facticius teruncius Damascius Confucius Palladius subradius triradius perradius ∙ stapedius ∙ Ventidius Dupondius ∙ Harmodius fastigius Malachius abrachius Strophius Heraclius Spigelius Cornelius Berzelius systilius Sabellius Vitellius Lucillius Mamillius Vendolius Marasmius Dardanius encranius Chlaenius disgenius Arrhenius cyllenius Flaminius Oulimnius Volumnius Cotunnius Trebonius Mardonius psaronius Petronius Suetonius Saturnius Asclepius Procopius Fallopius Eutropius tumbarius barcarius bordarius galearius gregarius burgarius topiarius retiarius ∙ ostiarius cellarius sagmarius firmarius plumarius lignarius Quinarius Furnarius scoparius librarius ferrarius vitrarius extrarius capsarius causarius lactarius contarius hastarius scutarius Sextarius ∙ pecuarius arcuarius januarius casuarius actuarius Sphaerius Hetaerius Guiderius posterius phthirius inglorius cursorius oratorius sartorius ∙ Pastorius Demetrius mercurius Thebesius Carausius Dionysius inflatius climatius Panaetius Lucretius propitius mauritius Maxentius mezentius Gerontius acceptius sublavius impervius Vitruvius trapezius ∙

10 letters

Alfarabius Ochthebius Laricobius Phyllobius Calamobius hemerobius Enterobius Amaurobius aleurobius Bolitobius merluccius Simplicius dediticius hyporadius Bruchidius Lathridius Psammodius megapodius Hemipodius dromiceius Proculeius Eubrychius Eustathius heteralius Grendelius pamphilius Servillius epicranius delphinius heliconius Posidonius Trophonius Apollonius Sempronius Calpurnius Asculapius carucarius veredarius essedarius lancearius balnearius laquearius plagiarius bestiarius mattiarius nauclarius scholarius Arcularius ducenarius harenarius ordinarius octonarius ∙ salararius numerarius Munerarius contrarius Belisarius legatarius sagitarius solitarius februarius Charadrius Desiderius guarnerius Dyschirius podalirius Sanctorius Holitorius engastrius industrius anastasius thespesius Hortensius Theodosius Sestersius Prudentius quamtotius correptius Propertius sestertius ∙ subclavius

11 letters

myrmecobius Alphitobius gentilicius deducticius interradius ∙ intermedius Polygordius tribrachius pyrrhichius monocranius mercedonius Monoclonius Aesculapius Aesculepius dactylopius duplicarius abecedarius dromedarius subsidarius scriniarius classiarius macellarius vexillarius muscularius tragularius Nummularius victimarius clibanarius dardanarius verbenarius trecenarius centenarius septenarius ∙ cortinarius antennarius draconarius liburnarius carcerarius tesserarius necessarius proletarius argentarius iumentarius ferentarius voluntarius acceptarius voluptarius balistarius sagittarius fructuarius scamandrius primicerius accessorius ∙ Stercorrius epigastrius Vigilantius laticlavius

12 letters

internuncius circumradius Ingolstadius hemiacardius holoacardius macrocardius microcardius monobrachius perobrachius antibacchius ∙ holoptychius abbotnullius Metanauplius Erichthonius stipendarius phalangarius

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