different between seedhead vs weedhead

English

seed +? head

seedhead (plural seedheads)

A part of certain plants that bears the seeds after flowering, as in the dandelion.
- 1994, Australian Mammal Society (volume 17, June 1994, page 61)
  Macropodids may take small berries or seedheads entirely into the mouth, grip the stalk, and pluck off the seedhead against the upper or lower incisors.

weed (“marijuana”) +? -head

weedhead (plural weedheads)

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