lake vs pond

lake and pond both are nouns.

Word	Noun	Adjective	Verb	Adverb
lake	Yes	No	No	No
pond	Yes	No	No	No

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

lake (noun)	pond (noun)
a body of (usually fresh) water surrounded by land	a small lake
any of numerous bright translucent organic pigments
a purplish red pigment prepared from lac or cochineal