'nut-flavoured' is a modern English compound of the noun 'nut' and the adjective 'flavoured' (from the verb 'flavour'). 'Nut' originates from Old English 'hnutu' meaning 'nut', and 'flavour' comes into English via Old French (e.g. 'flavor') ultimately related to Latin words for taste.

'nut' developed from Old English 'hnutu' into Middle and Modern English 'nut'. 'Flavour' entered Middle English from Old French (Middle English spelled 'flavour'), later forming the past-participial adjective 'flavoured'. The compound 'nut-flavoured' arose in Modern English by combining these elements to describe taste.

Individually, 'nut' referred to the edible seed and 'flavour' to taste; combined in Modern English they specifically describe something that 'has the taste of nuts'.