Questions about example sentences with, and the definition and usage of "Cinder"

A: embers can also refer to the flying glowing sparks of a dying fire

A: There isn’t really a difference. Soot always is a plural though, and usually used when it is in a pile. You wouldn’t say ‘a pile of cinder’, and you might say ‘a pile of cinders’ but you would not likely say ‘a pile of soot.’

A: Cinder. A small piece of burnt coal./wood that could still go on fire

Ash.. Powdery substance left after burning something

A: It's about the meaning. Loose means to release sth completely while loosen means to make sth less tight but not to set it free completely. In this case, it depends on the situation in which the sentence is said.