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One of the easiest ways of forming new words in putting two (or morę) old words together.
A compound is a lexeme which is madę up of two (or morę) other lexemes. Compounds in English are not always written in a consistent fashion for example south-east can be written with a hyphen, or with a space (south east) or fused (southeast).
Examples heat rash fiu virus spaghetti jun.... night bird, night
happy rash,
potato pancake toilet seat bookcase, car
Meaning relationships A CAUSES B A IS CAUSED BY B B RESEMBLES A B IS AT TIME A cap
A IS AT PLACE B earache B IS MADĘ OF A B IS PART OF A B IS FOR A pack
This list is not exhaustive.
Compounds are therefore potentially ambiguous on the first encounter. Ali the examples are of two-word compounds of the type NOUN+NOUN. They're of course other kinds of compounds as well.