What's the word for this?

Like an oxymoron is two contradictory words/concepts used together, what’s the word when I “double” a word, for example, when I combine two words with the same concept, basically, it serves as a kind of repeat??

Redundant.

In essence but not quite. I’m looking for the technical term.

Reduplication?

Tautology.

I dunno.

A large enormousness

isn’t really a tautology. If I said it was large because it was enormous, that’s getting tautological.

I don’t think there is a word, a noun.

Superfluity gets the idea, but is not specific at all.

I’m not sure why you think that. “A large enormousness” is a tautology, just as “a small enormousness” is an oxymoron.

The technical term for this is pleonasm.

Possibly, cool word nonetheless though. Cheers, thanks.

Pleonasm.

No, that would like PM in the afternoon.

siamsmile.webs.com/same-same/same-same.html
Still doesn’t answer your question.