Treasure has no article and no plural s and is thus used as an uncountable noun. That isn't particularly uncommon. Many countable nouns admit of such usage: I'm not man enough for her!
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English 1b3My question actually pertains to the phrase 'treasure enough to...", not to the noun itself.Treasure is a noun and enough is usually placed before nouns. However, no grammatical rule says it cannot follow a noun even though this isn't very common: