[erimir]

The linguist in me feels it necessary to point out that connotations refer to the cultural and emotional associations a word carries.

For example, "strong-willed" and "pig-headed" both denote "stubborn" but the connotations are different, as strong-willed is positive while pig-headed is negative (example from Wikipedia).

The components of "booty call" and "butt dial" are roughly synonymous, but as compound nouns, they do not denote the same thing. They are not synonyms.

For example, "Jeb!" and "John Ellis Bush!" denote the same thing, but "John Ellis Bush!" connotes confusion ("...who?") while "Jeb!" connotes excitement.