The noun is coach in this sentence and the noun function would be a common noun referring to the coach being talked about in the sentence. The pronoun is "himself" which the sentence refers to the coach. The pronoun class is a reflexive pronoun.
he was a friend
but this question actually has minority cons because the thesis of the quadratic quantum realm don't match the thesis.
The pronouns and antecedents in these sentences are:
His-Jeff: the pronoun "his" is used to refer that the woman is <em>Jeff's</em> mother.
They-flowers: To avoid the repetition of the word "flowers" the writer replaces it for the pronoun "they" in the second sentence.