I saw a ghost insect in my room last night.

I saw a school of ghost knifefishes swimming in the river.

I saw a trail of ghost ants in my kitchen.

The ghost runners sprinted across the field.

There were rumors of ghost voters during the election.

The ghost fields are said to be haunted by the spirits of the deceased.

The gauge ghost is an important concept in particle physics.

The ghost field is an important concept in particle physics.

The ghost nudibranch is a species of Lecithophorus capensis.

The forest was filled with ghost fungi.