I'm looking for a word that's the opposite of oxymoron. It would mean a word that goes with another word and matches perfectly, almost to the point of redundancy. I'm part Irish and I like to drink, I'm an Irish drinker. Happy grin.

What about :

correlative

noun grammar

Corresponding to each other and regularly used together

A word or concept that has a mutual relationship with another word or concept; ; mutually related

Indicating a reciprocal or complementary relationship: a correlative conjunction; expressing a reciprocal or complementary relation.

[medieval Latin correlativus from cor- together and relativus (see relative )]

?

You may have answered your own question:-? or just about. Dictionary.com has an interesting usage note on the word 'redundancy' which includes:
'..the use of what is regarded as an unnecessary modifier or qualifier can sometimes be justified on the grounds that it in fact makes a semantic contribution. Thus a hollow tube can be distinguished from one that has been blocked up with deposits...'

This applies to your 'happy grin'. For it could be a mischievous grin, couldn't it.

But you might like self-reflexive usages like a superfluous redundancy, or a redundant tautology:-). But you could glean some other opposites for oxymoron, depending on how exactly you want to define your oxymoron (literally 'pointedly foolish'), but the obvious answers seem fine for 'positive optimists' and the like.

a word that goes with another word and matches perfectly - there is one of these greek-latin hybrids that probably comes close: epitheton ornans .

I thought an epitheton ornans was a descriptive name after a proper name which became part of the proper name, as in William the Conqueror, Jimmy the Greek, Vlad the Impaler or Aethelred the Unready.

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I thought an epitheton ornans was a descriptive name after a proper name which became part of the proper name, as in William the Conqueror, Jimmy the Greek, Vlad the Impaler or Aethelred the Unready.

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Isn't that a rather subjective process though? Sometimes the epithet's status as part of the name may be less than universally accepted. For example, there are many people in India who do not consider Mohandas Karamchand Gandhi to have been a Mahatma.