What part of speech is the word in sentence cousin always a welcome

Let's break down the sentence and identify the part of speech:

* Cousin: This is a noun, as it names a person.

* Always: This is an adverb, as it modifies the verb "welcome" by indicating how often it happens.

* A: This is an article, specifically the indefinite article, used before a singular noun.

* Welcome: This is an adjective, as it describes the noun "cousin."

Therefore, the word "always" is the adverb in the sentence.