It could be the associative property.
Texas
Tennessee Avenue
A letter that starts with U is an urgent letter.
Bear starts with the letter B
A letter that starts with the letter C is a contractletter or a contact letter.A letter of condolence or a letter of congratulations.
letter that starts with u is unicorne
Iceberg lettuce is a vegetable. It starts with the letter i.
zoo
An employment letter starts with the letter E. Perhaps an empathy letter to someone who is ill or bereaved.
Anagram is a type of puzzle. It starts with the letter A.
Advance party is a synonym for in front. It starts with the letter a.
There is no color translated in engligh that starts with that letter.