backmost vs hindermost

backmost and hindermost both are adjectives.

Word	Noun	Adjective	Verb	Adverb
backmost	No	Yes	No	No
hindermost	No	Yes	No	No

As adjectives, backmost and hindermost are synonyms defined as:

Other synonyms of backmost include hindmost, rearmost.

backmost (adjective)	hindermost (adjective)
located farthest to the rear	located farthest to the rear