https://kagi.com/search?q=Pesticide

> Pesticides are substances that are used to control pests. They include herbicides, insecticides, nematicides, fungicides, and many others (see table). The most common of these are herbicides, which account for approximately 50% of all pesticide use globally.[0]

[0] https://en.wikipedia.org/wiki/Pesticide

You're trying to be pedantic, but you're actually wrong. If you think about it, from the perspective of anyone trying to raise crops, weeds are pests. (They are pests to lots of non-farmers, too.)

Similarly...

> A pest is any organism harmful to humans or human concerns. The term is particularly used for creatures that damage crops, livestock, and forestry or cause a nuisance to people, especially in their homes.

> Plants may be considered pests, for example, if they are invasive species or weeds.