"petal" is a noun.
Primarily as a noun: It is the representation of a tangible thing. However, it can also be used as an adjective or adverb, as in the phrases "cornflower blue" (as adverb, modifying the adjective "blue") or "cornflower petal" (modifying the noun "petal").
A petal is a part of a flower, a single flower has many/several petals - the petals are the colourful part of the flower we look at.
She gently plucked a petal from the flower and watched it float down to the ground.
petal
The petal is the colourful part of a flower that attracts pollinators. It is often the most visually striking part of the flower and plays a key role in the reproductive process.
petal?
metal petal
They ate the petal
Petal and Nectary!
Because it's a part of a plant
Attract polinisators (visible signal)/
petal metal