Can discharge from an sti look and smell similar to bv or yeast infection or are the completely different? (i'm a female by the way)

Can be similiar: There is no way to know if you have yeast, BV, trichomonas ( which is sexually transmitted), GC, or chlamydia based only on what a discharge looks and smells like. If you have a discharge that is unusual for you, you need to be tested and treated.

Pus: The discharge from a sty is pus. It does't smell good but its different than from a yeast infection.

Odor: Bacterial vaginosis and trichomonas both smell fishy. Chlamydia and GC may not have an odor. A yeast infection is very itchy and may have a thick white discharge.