רמש | fmr

a primitive root
Short definition
properly, to glide swiftly, i.e., to crawl or move with short steps; by analogy to swarm
creep, move
Long definition
1to creep, move lightly, move about, walk on all fours
1to creep, teem (of all creeping things)
2to creep (of animals)
3to move lightly, glide about (of water animals)
4to move about (of all land animals generally)

This verse proves that God here is referring to more than one entity. The image is referring to order, i.e. the laws. let them have dominion Man was given power over all the animals. During the time of Adam and Noah, all animals feared man (Genesis 9:2). The animals will go back to being in fear in the Kingdom of Israel (Isaiah 11:8). Note Man had already been created at this point, but the angels were saying "let's make man different from the animals", "let's give them the laws and order"

Strong's Concordance