This puzzle has two parts. First, what do the seven words below have in common? Second, given the value of the first six words, what is the value of the seventh?

MIRE = 1
REDO = 1
FARE = 2
SORE = 3
TIRE = 5
DODO = 7
SOFA = ?

Answers:

Each of the clue words is composed of two notes of the musical scale. The number is the difference in steps between the notes (starting with the lower note - regardless of order) as you count DO, RE, MI, FA, SO, LA, TI, DO.

SOFA = 1 

Credit:
GAMES/World of Puzzles
September, 2019
Peter Kaplan
NOTEWORTHY WORDS