Do Mirelurks understand words? dogmeat seems too, which creatures understand what you say in Fallout 4? ghouls obviously do but do the ferals also? Makes me wonder which enemies in Fallout are open to communication and what type.

a thread laced with fail

If you use the perk that can intimidate them... apparently they all understand words. Even radroaches. lol

Deathclaws not only understand basic morals or concept of honor, but also my necessity to own an awesome glove that looks like their hand; complete with the positive expectation of all these factors coming together and living, assumingly day and night waiting for it.

So yes, Deathclaws. They're on.

Deathclaws understand. they understand all but they say nothing they wait for there time.