soft market vs buyer's market

soft market and buyer's market both are nouns.

Word	Noun	Adjective	Verb	Adverb
soft market	Yes	No	No	No
buyer's market	Yes	No	No	No

As nouns, soft market and buyer's market are synonyms defined as:

soft market and buyer's market: a market in which more people want to sell than want to buy

Other synonyms of soft market include buyers' market.

soft market (noun)	buyer's market (noun)
a market in which more people want to sell than want to buy	a market in which more people want to sell than want to buy