Mammoth Uncensored Word List:
81 words ending with il, 8 letters long

aerofoil alguacil alguazil aventail bangtail basophil brantail bucktail cheveril cnidocil coattail cocktail coistril contrail coystril daffodil distrail dogstail doornail dovetail ducktail facemail fauteuil fishtail footrail foresail forktail gaffsail graymail gumbotil hairtail handrail hangnail headrail headsail hexafoil hightail horntail junkmail junksail landrail mainsail milltail mocktail mofussil monorail moonsail motorail multifil neuropil noncivil oenophil outcavil outpupil overboil oversail overtoil overveil parafoil parasail paravail pickadil ponytail reassail redistil rheophil ringtail siderail silktail sliprail spandril staysail stunsail taffrail thiophil tranquil treenail verticil whiptail windsail wingsail