stfu

As an interjection lol

is alternative form of LOL|lang=en.

As a verb lol

is alternative form of LOL|lang=en.

As a noun LOL

is Loyal Orange Lodge, a prefix given to all branches of the Loyal Orange Order. For example, LOL 1 is Portadown branch.

As an initialism STFU is

shut the fuck up; emphatic and vulgar form of shut up.

As initialisms the difference between sthu and stfu

is that sthu is shut the hell up; emphatic form of shut up while STFU is shut the fuck up; emphatic and vulgar form of shut up.

As a noun taxonomy

is the science or the technique used to make a classification.

As an initialism stfu is

(internet|vulgar) shut the fuck up; emphatic and vulgar form of shut up.