A noun is a °root that denotes an object.
"Noun" is defined here in notional terms, following Haspelmath (2023) (see also this blogpost: https://dlc.hypotheses.org/3467). Many authors define "noun" also (or alternatively) in terms of coding strategies, but languages show substantial differences in this respect. The definition proposed by Lehmann & Moravcsik (2000: 733) has the downside that one does not know how salient the grammatical properties need to be in order to single out a grammatical class (and distinguish it, say, from a formally defined adjective class).