greater spearwort vs bog plant

greater spearwort and bog plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
greater spearwort	Yes	No	No	No
bog plant	Yes	No	No	No

As nouns, bog plant is a hypernym of greater spearwort; that is, bog plant is a word with a broader meaning than greater spearwort:

greater spearwort: semiaquatic European crowfoot with leaves shaped like spears
bog plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

Other hypernyms of greater spearwort include marsh plant, swamp plant.

greater spearwort (noun)	bog plant (noun)
semiaquatic European crowfoot with leaves shaped like spears	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath