Allyl radical and Chemical group

Allyl radical noun - The univalent unsaturated organic radical C3H5; derived from propylene.

Chemical group and allyl radical are semantically related. In some cases you can use "Chemical group" instead a noun phrase "Allyl radical".

Chemical group noun - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule.

Allyl radical and chemical group are semantically related. Sometimes you can replace phrase "Allyl radical" with "Chemical group", this phrases are similar.