Feeler
Part of speech: noun
Definition: Someone or something that feels. An antenna or appendage used for feeling, especially on an insect. Something ventured to test (an)other(s)' feelings, opinion, position.
Overture
Part of speech: noun
Definition: An approach made to initiate communication.a musical introduction to a piece of music which may or may not be an integral part of that piece of musicin law, especially in Church law, a motion placed before a legislative body, such as the General Assembly of the Church of Scotland.