Final answer:
In English grammar, the joining of a verb and a noun is referred to as subject-verb agreement, ensuring that singular subjects are paired with singular verbs and plural subjects with plural verbs.
Step-by-step explanation:
The term used to describe the action of joining a verb and a noun together in English grammar is generally referred to as agreement or subject-verb agreement. This concept ensures that a verb agrees in number with its subject, meaning that singular subjects are paired with singular verbs and plural subjects with plural verbs. For example, in the sentence 'The dog barks,' 'dog' is a singular noun and 'barks' is a singular verb, showing subject-verb agreement.
In addition to basic agreement, there are other terms related to how verbs and nouns can be joined or modified. Inflection is the way in which a word is changed or adapted to express different grammatical categories such as tense, mood, voice, aspect, person, number, gender, and case. An example of inflection is adding -s to a noun to make it plural (such as 'dog' to 'dogs') or to a verb to agree with a third-person singular subject in the present tense ('bark' to 'barks').
While some of these terms are related, agreement is the best fit for the concept of a verb and noun joining together in the context of a sentence.