QUERY: List of Japanese expressive sounds.

Hello,

I'm looking for a Web page or section of a book listing such
expressive sounds in Japanese as "ne," "n," "yo," "saa," "fun,"
"yosh," and so forth. What is the formal name for such sounds?

Am I correct in thinking, as a general rule, that "n" is "no" and
nominalizes what directly precedes it? If so, is nominalization a
general means of indicating a closeness or intimacy in the
utterance?

Also, am I correct in thinking that Japanese contains more of
these expressive sounds than English?

Thank you.