"Constrict" means to squeeze tightly. There is a snake called a boa constrictor that kills its prey by wrapping itself around it and sqeezing it to death; you can think of a boa constrictor when you hear the word "constrict" to help you remember. Some examples: "During a severe allergic reaction, your throat constricts, making you unable to breathe." - here, your throat is sqeezing shut. "She felt constricted by the tight clothes." - here, she feels that her clothes are sqeezing her tightly. "Restrict" is a little different. It means to confine or limit. We can change the above examples a little to demonstrate how to use restrict: "During a severe allergic reaction, your throat constricts, restricting your breathing." - here, because your throat is sqeezing shut (constricting), your breathing is limited. "Her movement was restricted by the tight clothes." - here, because the clothes are very tight, her ability to move is limited. "Erupt" and "spew" are similar, but "erupt" is usually more violent in nature. "The volcano started spewing volcanic ash just before it erupted." - the spewing of the volcanic ash is much less violent than the actual eruption "Angered that no one was heeding the nonsense he was spewing everywhere, he suddenly erupted and started screaming at everyone around him." - spewing nonsense means saying lots of things that make no sense; erupt in this case means he got very angry and expressed his anger (in this case by screaming). In terms of capitalization, you would only capitalize single words in quotations if they are said by someone, are proper nouns, or appear at the beginning of a sentence; otherwise, you shouldn't capitalize them. What is the difference between "constrict" and "restrict"? He said, "No." The words written on the stone spelled out "Rome". "Restrict" means to limit, while "constrict" means to squeeze or compress. I hope that helps! Let me know if I can clarify anything.

Constrict is like "to contract or shrink." So, a shirt that is too small would feel constricting. Restrict is like "to place boundaries or limits." So, you can think of areas that have signs that say "employees only." They are restricted to the public. Spew and erupt mean basically the same thing but erupt would be thought of as more violent, like a volcano.

He felt his throat constrict. It has implications of narrowing. Restrict is very similar but broader. The bank restricts access to the vault. Spew has negative connation. He is spewing bullshit. Erupt is used with volcanic activity or a surge. The player erupted to lead his team with 3 goals.

You may capitalize it or not. You're just asking a question, not writing a sentence. I can't think of a rule that would govern this.