taberu is a verb that means "to eat". tabemasu (pronounced "tabemas"...there is no "s" by itself in Japanese) means "eat" or "eating".
tabete means "eat", which is the imperative. I have never heard tabetemasu before.
I highly recommend moving quickly away from romaji to at least hiragana. It may make the verb conjugation easier to understand, and sets you up for success in learning Japanese.