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Units of Meaning (Word Types, Lexernes)

•    One-morpheme word/simplex - a word built of one (free) morpheme (e.g. crush)

•    Compound word - an expression that consists of at least two free morphemes

•    Complex word - a word built of at least two morphemes

- idiom - multi-element expression whose meaning is not motivated by (i.e. cannot be directly derived from) the meaning of its components (this phenomenon is called non-compositionality) and the substitution of a single element, if possible, brings unsystematic change of meaning e.g. Tve got a crush on you' meaning Tm in love with you'.

•    Phraseological unities - their meaning is partially motivated by the meanings of the words they contain (show one's teeth - szczerzyć zęby)

•    Collocations - highly motivated but hardly interchangeable (bear a grudge - chować urazę)