This is the 11775th most frequent German word.
taxifahrer
Taxi driver.
Here the word 'Taxifahrer' is used as a subject in the nominative case describing the driver.
Der Taxifahrer war sehr freundlich und brachte mich sicher nach Hause.
The taxi driver was very friendly and brought me safely home.
The word 'Taxifahrers' here is in the genitive case, indicating possession of the taxi by the taxi driver.
Ich habe meine Jacke im Taxi des Taxifahrers vergessen.
I forgot my jacket in the taxi of the taxi driver.
Here, 'Taxifahrer' is in the dative case, functioning as the indirect object receiving the tip.