1. Loanwords: These are words adopted from another language. They are "borrowed" into the language, often because they describe concepts or objects that don't have an equivalent word in the target language. Examples:
* Sushi (from Japanese)
* Kindergarten (from German)
* Mafia (from Italian)
2. Nouns used as adjectives: This is a common grammatical phenomenon where a noun is used to modify another noun, effectively acting as an adjective. For example:
* "A glass door" (glass, the noun, acts as an adjective describing the door).
* "A chocolate cake" (chocolate, the noun, acts as an adjective describing the cake).
3. Nouns used as verbs: This is another common grammatical process called "verbification." Nouns can be used as verbs to describe actions related to the noun. For example:
* "Google it" (Google, the noun, is used as a verb meaning "to search for information on Google").
* "Facebook your friends" (Facebook, the noun, is used as a verb meaning "to connect with friends on Facebook").
If you could provide context or an example of what you meant by "borrowed noun", I can help you understand the specific concept better.