pachyderm vs elephant

pachyderm and elephant both are nouns.

Word	Noun	Adjective	Verb	Adverb
pachyderm	Yes	No	No	No
elephant	Yes	No	No	No

As nouns, elephant is a hyponym of pachyderm; that is, elephant is a word with a more specific, narrower meaning than pachyderm:

pachyderm: any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus
elephant: five-toed pachyderm

pachyderm (noun)	elephant (noun)
any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus	five-toed pachyderm
	the symbol of the Republican Party; introduced in cartoons by Thomas Nast in 1874