master of ceremonies: a person who acts as host at formal occasions (makes an introductory speech and introduces other speakers)
organism: a living thing that has (or can develop) the ability to act or function independently
worm: any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae