minisub vs minisubmarine

minisub and minisubmarine both are nouns.

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

As nouns, minisub and minisubmarine are synonyms defined as:

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

minisub (noun)	minisubmarine (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