system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: the rule in English that makes 'enough' pronounced like 'enuff' but 'though' is pronounced 'tho'
gpt
Congratulations, you've just figured out by yourself the first lesson of Linguistics 101: Orthography (writing system) has absolutely nothing to do with language. 

Language is part of the human experience. Every human being has language and learns it without being taught. Orthography is something that we have invented, and you have to go to school to learn it. 

Have some more:

uf- enough, rough, tough  
af- cough, trough  
au- bough, drought, plough  
ou- dough, though  
aa- bought, sought, thought  
oo- brougham, slough, through  
uh- thorough, borough (in some dialects, esp. British)  
up- hiccough  
ok- hough (spelling reformed to "hock" in the 20th century)  
okh- lough (irish spelling of "loch")  

If you're curious, how this happened is that these all used to be pronounced the same: the "lough" one. The "kh" (ipa: /x/) phoneme left the English language, and people found new ways to pronounce words that used to have it.