aft vs abaft

aft is an adjective but abaft is not an adjective.

Word	Noun	Adjective	Verb	Adverb
aft	No	Yes	No	Yes
abaft	No	No	No	Yes

As adverbs, aft and abaft are synonyms defined as:

aft and abaft: at or near or toward the stern of a ship or tail of an airplane

Other synonyms of aft include astern.

aft (adjective)	abaft (adjective)
(nautical, aeronautical) situated at or toward the stern or tail

aft (adverb)	abaft (adverb)
at or near or toward the stern of a ship or tail of an airplane	at or near or toward the stern of a ship or tail of an airplane