minisubmarine vs minisub

minisubmarine and minisub both are nouns.

Word	Noun	Adjective	Verb	Adverb
minisubmarine	Yes	No	No	No
minisub	Yes	No	No	No

As nouns, minisubmarine and minisub are synonyms defined as:

minisubmarine and minisub: submersible vessel for one or two persons; for naval operations or underwater exploration

minisubmarine (noun)	minisub (noun)
submersible vessel for one or two persons; for naval operations or underwater exploration	submersible vessel for one or two persons; for naval operations or underwater exploration