lizard vs chamaeleon

lizard and chamaeleon both are nouns.

Word	Noun	Adjective	Verb	Adverb
lizard	Yes	No	No	No
chamaeleon	Yes	No	No	No

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

lizard: relatively long-bodied reptile with usually two pairs of legs and a tapering tail
chamaeleon: lizard of Africa and Madagascar able to change skin color and having a projectile tongue

lizard (noun)	chamaeleon (noun)
relatively long-bodied reptile with usually two pairs of legs and a tapering tail	lizard of Africa and Madagascar able to change skin color and having a projectile tongue
a man who idles about in the lounges of hotels and bars in search of women who would support him