pond vs mere

pond and mere both are nouns.

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

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

Other hyponyms of pond include fishpond, horsepond, millpond, swimming hole, water hole.

pond (noun)	mere (noun)
a small lake	a small pond of standing water

pond (adjective)	mere (adjective)
	apart from anything else; without additions or modifications
	being nothing more than specified