Continuous strands of fiber are known as Fiberglass or E-Glass.

thread, strand, filament, tendril, pile, texture, wisp

Strand would work, as would fiber or thread.

A fiber can be a noun, or adjective in fiberous. The term means a strand of material

The homonym for "strand" is "strand," which can refer to a stretch of beach or a single thread or fiber. A type of tree that sounds like "strand" is a "yew tree," which is a type of coniferous tree known for its dark green needles and red berries.