Fissure and Grommet

Fissure noun - An irregular usually narrow break in a surface created by pressure.

Grommet and fissure are semantically related. In some cases you can use "Grommet" instead a noun "Fissure".

Grommet noun - Fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines.

Fissure and grommet are semantically related. Sometimes you can use "Fissure" instead a noun "Grommet".