As adjectives the difference between interlinear and interlineary
is that interlinear is (of text) inserted between the lines of a text while interlineary is interlinear.
As nouns the difference between interlinear and interlineary
is that interlinear is such a text while interlineary is a book containing interlineations.
interlinear
English
Adjective
(head)
(of text) inserted between the lines of a text
having alternate lines of text in different languages