Conjugation
Part of speech: noun
Definition: The coming together of things. The temporary fusion of organisms, especially as part of sexual reproduction Sexual relations within marriage In some languages, one of several classifications of verbs according to what inflections they take. The act of conjugating a verb. A system of delocalized orbitals consisting of alternating single bonds and double bonds
Union
Part of speech: noun
Definition: The act of uniting or joining two or more things into one, or the state of being united or joined; junction; coalition; combination.That which is united, or made one; something formed by a combination or coalition of parts or members; a confederation; a consolidated body; a league.A joint or other connection uniting parts of machinery, such as pipes.The set containing all of the elements of two or more sets.The act or state of marriage.Sexual intercourse.A data structure that can store any of various items, but only one at a time.
Example sentence: Experts on romance say for a happy marriage there has to be more than a passionate love. For a lasting union, they insist, there must be a genuine liking for each other. Which, in my book, is a good definition for friendship.