lizard vs chameleon

lizard and chameleon both are nouns.

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

As nouns, chameleon is a hyponym of lizard; that is, chameleon 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
chameleon: lizard of Africa and Madagascar able to change skin color and having a projectile tongue

lizard (noun)	chameleon (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	a changeable or inconstant person