In English, in my opinion at least, "flower" describes the inflorescence at any point in its growth cycle, while "blossom" describes the flower at its fullest development. More often though, "blossom" is used as a verb meaning to bloom or to develop.

"Blossom" essentially means "flower". It's just not used as often. At least not in American English.

I usually say ‘blossoms’ for trees though it can sometimes imply blossoming IE new flowers in English

Interesting, thank you. I guess I should instead say, then, that I have never seen any flowers on any maple trees and I have seen tons of maple trees. But I didn't know that. I'll have to do some reading. I love plants. You could study them all day every day and die knowing so little about them.

Wow, I'll have to look out up. None of the maples in my region do.