Adulator and Groveler

Adulator noun - A person who uses flattery.

Groveler and adulator are semantically related In some cases you can use "Groveler" instead a noun "Adulator".

Groveler noun - Someone who humbles himself as a sign of respect; who behaves as if he had no self-respect.

Adulator and groveler are semantically related in sycophant topic. You can use "Adulator" instead a noun "Groveler", if it concerns topics such as person who caters to another.