snow-in-summer vs snow-on-the-mountain

snow-in-summer and snow-on-the-mountain both are nouns.

Word	Noun	Adjective	Verb	Adverb
snow-in-summer	Yes	No	No	No
snow-on-the-mountain	Yes	No	No	No

As nouns, snow-in-summer and snow-on-the-mountain are synonyms defined as:

snow-in-summer and snow-on-the-mountain: annual spurge of western United States having showy white-bracted flower clusters and very poisonous milk

Other synonyms of snow-in-summer include Euphorbia marginata, ghost weed.

snow-in-summer (noun)	snow-on-the-mountain (noun)
chickweed with hairy silver-grey leaves and rather large white flowers	annual spurge of western United States having showy white-bracted flower clusters and very poisonous milk
annual spurge of western United States having showy white-bracted flower clusters and very poisonous milk