We look into three unpleasant words, turd, crap and dung.

You may decide which is what in Russian, but mind that ENG speakers have different circumstances they meet these words, so practice of using them is different in USA, UK, Australia, etc.
turd - turd (tûrd)
n. Vulgar
1. A piece of excrement.
2. Slang An unpleasant or contemptible person or thing.
crap - crap (krăp)
crap 1 (krăp) Vulgar Slang
n.
1. Excrement.
2. An act of defecating.
3. Foolish, deceitful, or boastful language.
4. Cheap or shoddy material.
5. Miscellaneous or disorganized items; clutter.
6. Insolent talk or behavior.
7. Used for intensive effect in idioms such as beat the crap out of (someone) for beat (someone) very badly.
intr.v.
To defecate.
interj.
Used to express anger or displeasure.
crap 2 (krăp)
n.
1. See craps, the game.
2. A losing first throw in the game of craps.
v.
To make a losing throw in the game of craps. Usually used with out.
dung - dung (dŭng)
n.
1.a. The excrement of animals.
b. Manure.
2. Something foul or abhorrent.
tr.v.
To fertilize (land) with manure. https://www.thefreedictionary.com/turd https://www.thefreedictionary.com/crap https://www.thefreedictionary.com/dung