Allay vs Alley vs Ally

allay (동사): (특히 감정을) 가라 앉히다, 완화하다

"Allay" is a verb meaning to reduce the intensity, lay to rest, or pacify and calm. 

예) His mother attempted to allay his fears.

alley (명사): 골목, 오솔길 (복수: alleys)

"Alley" is a noun meaning a narrow passageway. 

예) There is an alley behind the buildings.

ally (동사; 명사): 동맹을 맺다; 동맹 (복수: allies)

"Ally" is a verb or noun meaning to connect by some relationship usually showing helpfulness or kinship.

예) The United States is a close ally of England.