4) Dvanda Compounds:

Dvanda compounds are two nouns that are added together with no added
meaning due to the compounding.

Examples in English:

Sixty-seven: sixty+seven (not) sixty 7's
Bitter-sweet: Bitter+sweet


Examples in Paa.li:

Candimasuriyaa: the sun and the moon
Sama.nabraahmanaa: Samanas and Brahmins