snow-in-summer vs ghost weed

snow-in-summer and ghost weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
snow-in-summer	Yes	No	No	No
ghost weed	Yes	No	No	No

As nouns, snow-in-summer and ghost weed are synonyms defined as:

snow-in-summer and ghost weed: 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, snow-on-the-mountain.

snow-in-summer (noun)	ghost weed (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