A synonym is something that means the same or similar to something else. Just think, "Same, Similar." The first letter of 'synonym' is "s". Same with the word "same/similar". So the "s" in "synonym" means same, similar. Easy right??
Yes. A typical black hole has a mass similar to that of a large star and so would have the same same gravitational effects on objects in the general vicinity. At close range the gravity becomes extremely strong.