different between dogwood vs cottonwood

English

dag +? wood, from dag (“a sharp object”).

dogwood (countable and uncountable, plural dogwoods)

Any of various small trees of the genus Cornus, especially the wild cornel and the flowering cornel
The wood of such trees and shrubs.
A wood or tree similar to this genus, used in different parts of the world.

cotton +? wood

cottonwood (plural cottonwoods)

A tree from one of number of species of tree in the genus Populus (poplars), typically growing along watercourses, with fluffy catkins.
- […] and through the middle of this forest, from wall to wall, ran a winding line of brilliant green which marked the course of cottonwoods and willows.
Populus sect. Aigeiros, a taxonomic section of the poplar genus
A flowering shrub or tree, the cottonwood hibiscus (Talipariti tiliaceum, syn. Hibiscus tiliaceus), in the mallow family.
A tree, Ceiba pentandra, native to the American tropics and west Africa; silk-cotton tree.

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