teatime

As nouns the difference between kettledrum and teatime

is that kettledrum is a large hemispherical brass percussion instrument (one of the timpani) with a drumhead that can be tuned by adjusting its tension while teatime is the traditional time, in the late afternoon, for serving tea (the meal).

As nouns the difference between teatime and dinnertime

is that teatime is (chiefly|british) the traditional time, in the late afternoon, for serving tea (the meal) while dinnertime is the time when dinner takes place.