Sisters
noun
Your older sister and your younger sister. These are your sisters.
しまい
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
二人の姉妹はとてもよくにています。
Those two sisters look so alike.
何か、二人って姉妹みたいだよね。
Hey, you two kinda look like sisters.
単なる女友達には無い絆が、姉妹の間にはある。
There is a bond between sisters that isn’t shared between girls who are just friends.