Frighten suggests causing a significant degree of fear in a person, often directly and immediately: A noise frightened us. When the fear overcomes a person or intimidates them so that they back down, then daunt is a good choice. Daunt comes from a Latin verb meaning “to tame or subdue.” It’s often a prospect, challenge, or task that daunts a person—that is, something that lies before them, rather than something immediately frightening. If not the task itself, the scale, scope, or magnitude of it may daunt the doer.

Both words refer to a boundary where a surface or area ends. An edge is any line that bounds an area—the eastern edge of the city; trim the edges of the paper, and it usually functions like a line, without width, that divides one area from another. A periphery, which is a boundary all the way around a surface or area, is less exactly located than an edge and more like a space on either side: Set up the tables around the periphery of the room; countries along the western periphery of China. Periphery is frequently used of tracts or lots of land: the airport’s periphery; urban periphery. 

Hidden is the past participle of hide, as in, I’ve hidden the presents, but also an adjective often used with abstract nouns to suggest something present but not apparent or not perceivable: hidden talent; hidden meaning. Latent, which derives from a Latin verb meaning “to lie hidden,” can be a strong synonym for hidden. Latent refers to a power, ability, or emotion that is present as a potential, but is not yet apparent, fully developed, or openly expressed. A talent can lie or remain latent, hidden even from the possessor of it, if there has been no opportunity to develop or use it. A perceptive therapist might observe that a client’s frequent use of sarcasm reveals latent anger.