This is the 9557th most frequent Russian word.
франкфурте
"Франкфурте" is not a standalone word in Russian; it may refer to "Франкфурте" (prepositional case of Франкфурт), meaning "in Frankfurt" (a city in Germany).
Here 'Франкфурте' is used in the prepositional case to indicate the location where an action occurred.
Я был во Франкфурте во время отпуска.
I was in Frankfurt during my vacation.
In this sentence, 'Франкфурте' is used to describe the place where an event occurs, in the prepositional case after 'в'.
В Франкфурте проводится крупнейшая книжная ярмарка.
The largest book fair is held in Frankfurt.
Here 'Франкфурта' is in the genitive case to denote possession, referring to the city the residents belong to.