This is the 2786th most frequent Russian word.
обе
"Обе" means "both" (referring to two feminine nouns).
The word "обе" is used to refer to two feminine nouns jointly, in this case, "подруги" (friends).
Обе подруги отправились в путешествие.
Both friends went on a journey.
This example demonstrates the usage of "обе" with the word "фотографиях" (photographs), which is also feminine and in the prepositional case.
На обех фотографиях изображены красивые пейзажи.
Both photographs show beautiful landscapes.
Here, "обе" pertains to "книги" (books), a feminine noun in the accusative case.