Hello, Marina! How do you do? :) Lose: Verb - They didn't expect to lose the match last night. Lost: Past simple and past participle form of the verb 'Lose' -> I have lost my wallet. I can't find it anyhwhere. // We lost the match last night. Loss: Noun -> For sure, his dad's death was a huge loss for the whole family. Work can be used both as a verb and a noun. -> I am working right now (verb) // I think I left my keys at work (noun) I hope this's been useful. Bye! :)