Word: knotweed
Part of speech: Noun
Syllables: knot
weed
Definition: Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers
Morphemes:
Affix: knot
Language: en
PoS: Noun
Meaning: A protuberant joint in a plant.
Affix: weed
Language: en
PoS: Noun
Meaning: Any plant regarded as unwanted at the place where, and at the time when it is growing.