American brooklime vs bog plant

American brooklime and bog plant both are nouns.

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

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

American brooklime: plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers
bog plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath

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

American brooklime (noun)	bog plant (noun)
plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers	a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath