A scientist follows the scientific method, i.e. they advance testable hypotheses and compare their predictions with the data. A philosopher writes deep-sounding but ultimately meaningless drivel like this:
It's not lost on me that Tractatus was warmly received by philosophers, but Investigations got a frostier reception from the same group. I especially enjoyed Russell's snippy quote. Ol Ludwig struck a nerve, did he, Bert?
https://en.wikipedia.org/wiki/Tractatus_Logico-Philosophicus