In Modals^x, Determiners^x

Hello, this is my first post here, I like to know these wordskilometercentimeterAre those words noun if they are standing alone ? if it's, what kind of noun it's, proper noun or abstract noun or etc ?After that, I want to indentify the part of speech of the following setence by using the...

That's ok, JK. Yes, you could say: 'Businesses try to maximise their profits.' I'm not sure how you'd add 'economist' to that, though. {My, your, their, our, his, her, its} are possessive determiners. These act like adjectives: 'my book', etc. {mine, yours, theirs, ours, his, hers, its} are...