1-- a word is a series of morphemes separated from other words by blank spaces, and carrying semantic meaning.
2-- a root is the simplest form of a lexical morpheme, upon which words are built; for example, the root -dors- produces the words dorsal, endorse, dossier, etc.
3-- a suffix is usually a single bound morpheme which is not a word in itself, but which attaches to roots to form words, usually to indicate part of speech or declension; the suffix -ist produces the nouns sophist, linguist, pianist, etc.
4-- a lexical item is a dictionary-form word.
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