This is the 9547th most frequent Japanese word.
綿
"綿" means "cotton" in English.
In this sentence, 綿 refers to cotton as a material.
このシャツは綿100%でできています。
This shirt is made of 100% cotton.
Here 綿 is used to mean raw cotton used for crafting items.
彼は綿を使って自分の枕を作りました。
He made his own pillow using cotton.
In this context, 綿 describes fluffy cotton that metaphorically resembles clouds.