2 words in this vocabulary list
noun a group of people, vehicles, or ships that work together to guard or patrol an area
verb to keep watch over an area by regularly walking or traveling around it
noun a person, place, thing, or idea. In this case, 'doorstep' is a noun referring to the area in front of someone's door.
pronoun a word that can function by itself as a noun phrase and that refers either to the participants in the discourse (e.g. I, you) or to someone or something mentioned elsewhere in the discourse (e.g. she, it). In this case, 'someone's' is a possessive pronoun
preposition a word that shows the relationship between a noun (or pronoun) and other words in a sentence. In this case, 'at' and 'on' are prepositions indicating location.