He claimed his half share of the booty. (Identify the word class of the underlined word 'half')

In this sentence, 'half' is modifying the noun 'share', describing what kind of share is being claimed. When a word modifies a noun by describing its quantity or quality, it functions as an adjective. While 'half' can also function as a determiner in some contexts, in standard grammatical analysis for sentences like 'half share', it is classified as an adjective describing the share.