What word defines something that is but

You're looking for a word that means "something that is but..." It's a bit tricky because "but" is a conjunction, not a descriptor. However, I can think of a few options depending on what you're trying to say:

If you're looking for a word that means "something that is but not...":

* Except: This is the most direct translation of "but" in this context. Example: "Everything is beautiful, except for the broken vase."

* Despite: This implies a contrast or contradiction. Example: "Despite being tired, she finished her work."

* Nevertheless: Similar to "despite," this emphasizes a contrast. Example: "He was sick, nevertheless, he came to the party."

* However: This introduces a contrasting idea. Example: "I tried my best, however, I failed."

If you're looking for a word that means "something that is simply...":

* Merely: This emphasizes the simplicity or ordinariness of something. Example: "It was merely a misunderstanding."

* Just: This can also mean "simply" or "only." Example: "He's just a kid."

If you're looking for a word that means "something that is limited to...":

* Only: This implies that something is restricted or exclusive. Example: "The only solution is to leave."

If you need more context, please tell me what you're trying to describe, and I can give you a more specific answer!