Crossword puzzle clue "certain language unit"

as in maltese cross, a mechanism providing intermittent frame-by-frame movement in a motion picture film projector

the fundamental unit of the lexicon of a language e.g. find, found, and finding are members of the English lexeme find

a word taken from another language

of a cat, to make a high pitched cry

a word or part of a word that contains no smaller unit of meaning e.g. 'man' or the 'ed' in 'walked'