Clue: Kind of love that's very open, like 8 and 15 exemplifying 3 7 (5)
Answer: AGAPE
Explanation: AGAPE is a Greek term for a type of selfless love. I would have pronounced this to roughly rhyme with 'swagger pay' – checking Chambers, the last syllable sounds like 'pee' 
AGAPE rhyming with 'tape' means "very open"
 
this is a pair of HOMO GRAPHS, like 8 and 15 – two words sharing the same spelling (but, in each of these cases, with different pronunciations)