European brooklime vs bog plant

European brooklime and bog plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
European brooklime	Yes	No	No	No
bog plant	Yes	No	No	No

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

European brooklime: European plant having low-lying stems with blue flowers; sparsely naturalized in North America
bog plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

Other hypernyms of European brooklime include marsh plant, swamp plant.

European brooklime (noun)	bog plant (noun)
European plant having low-lying stems with blue flowers; sparsely naturalized in North America	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath