get off vs dismount

get off is not a noun while dismount is a noun.

Word	Noun	Adjective	Verb	Adverb
get off	No	No	Yes	No
dismount	Yes	No	Yes	No

As verbs, get off and dismount are synonyms defined as:

Other synonyms of get off include get down, light, unhorse.

get off (noun)	dismount (noun)
	the act of dismounting (a horse or bike etc.)

get off (verb)	dismount (verb)
escape potentially unpleasant consequences; get away with a forbidden action	alight from (a horse)
cause to be acquitted; get off the hook; in a legal case
deliver verbally
transfer
get high, stoned, or drugged
send via the postal service
alight from (a horse)
get out of quickly
leave a vehicle, aircraft, etc.
enjoy in a sexual way
be relieved of one's duties temporarily