Regarding biology or chemistry, molecule can have different meanings. You're good havasu.

Molecule

Definition
noun, plural: molecules
A tiny or a very small piece (of something).
(biology or biochemistry) An extremely small particle or substance, especially at cellular or structural level, as a biomolecule.
(physics and chemistry) The smallest unit of an element or compound, made up of two or more atoms held together by strong chemical bond.

https://www.biologyonline.com/dictionary/mole...Supplement