infinitive vs lexical item

infinitive

noun
  • A verbal noun formed from the infinitive of a verb. 

  • A non-finite verb form considered neutral with respect to inflection; depending on language variously found used with auxiliary verbs, in subordinate clauses, or acting as a gerund, and often as the dictionary form. 

  • The infinitive mood or mode (a grammatical mood). 

adj
  • Unlimited; not bounded or restricted; undefined. 

  • Formed with the infinitive. 

lexical item

noun
  • A term—word or a sequence of words—that acts as a unit of meaning, including words, phrases, phrasal verbs and proverbs, exemplified by cat, traffic light, take care of, by-the-way, and don't count your chickens before they hatch. 

How often have the words infinitive and lexical item occurred in a corpus of books? (source: Google Ngram Viewer )