Lexical integrity

Lexical integrity is a term used to refer to one of the most important properties of words, viz. the property that no syntactic process is allowed to refer to parts of a word.

Example
if we take the English compound teapot, it is not allowed to move tea out of the compound by, for instance, topicalization (cf. *Tea, I bought pots vs. Teapots, I bought). It is furthermore impossible to refer to tea by using an anaphoric device such as a pronoun: we cannot say he took the teai pot, and poured iti into the cup, meaning 'he poured the tea into the cup'. See Lexicalist hypothesis.

Link
Utrecht Lexicon of Linguistics