different between ragweed vs tumbleweed

English

rag +? weed

ragweed (plural ragweeds)

A plant of the genus Ambrosia. These weeds are particularly noted for producing pollen which people with hay fever are allergic to.

tumble +? weed

tumbleweed (countable and uncountable, plural tumbleweeds)

Any plant which habitually breaks away from its roots in the autumn, and is driven by the wind, as a light, rolling mass, over the fields and prairies; as witch grass, wild indigo, Amaranthus albus, etc.
(attributive) Describing unwanted silence and inactivity. Often used of a situation when one makes a statement that is ignored or ill-received by one's audience, as the resultant silence is likened to that of a desolate desert with rolling tumbleweeds.
A tan colour, like that of a tumbleweed.

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