Can you explain more carefully, this question doesn't really make sense. "Subject" is feature of the grammar of a sentence, it's not something that is part of a word. If you mean "does 見 appear in multi-kanji words", the answer is yes, e.g. 見事.
sorry for confusing you, i mean this kanji is prefer to be a verb, but i also see a lot in the compound words like 見学、見聞、私見 is like being a noun than a verb, but is that true in that kind of compound word, this kanji can also be a noun?. thank you for the answer btw.
The part of speech of a word that a kanji appears in is independent of the kanji, regardless of any tendencies for particular kanji. Just check the part of speech listed and don't worry about what you expect the kanji to usually be.
Similar to chinese, every kanji in japanese, BROADLY SPEAKING, can be anything. 見 can be a verb (to look/see), or a noun (the act of looking, the way of looking). 青 can be an adjective (to be blue/pale), or a noun (things that have the color blue), or a verb (making/painting something blue, purifying some thing). this is why jisho mark many compound words as noun and verb at the same time.
in 見学, both of 2 kanji is a verb, it means to look and to learn, which vaguely form the meaning of this compound. It's also a noun just because that's how kanji works, you can use it to say The Act of something
in 私見, 私 is adjective (personal), and 見 is noun (the way of seeing things, aka opinion) => personal opinion.
noun or verb only?
Can this kanji refer to a noun or subject in a compound word?