Little Joe vs quaternion

Little Joe and quaternion both are nouns.

Word	Noun	Adjective	Verb	Adverb
Little Joe	Yes	No	No	No
quaternion	Yes	No	No	No

As nouns, Little Joe and quaternion are synonyms defined as:

Little Joe and quaternion: the cardinal number that is the sum of three and one

Other synonyms of Little Joe include 4, four, foursome, IV, quadruplet, quartet, quatern, quaternary, quaternity, tetrad.

Little Joe (noun)	quaternion (noun)
the cardinal number that is the sum of three and one	the cardinal number that is the sum of three and one