1) The word 'alike' can be used as an adjective, meaning 'similar'.
e.g. The two brothers look alike.
2) It can also be an adverb meaning 'in the same way'.
e.g. The brothers often dress alike.
3) But did you notice how I used 'alike' in last week's essay?:
Video cameras make cities safer for inhabitants, workers and visitors alike.
Can you write a sentence using 'alike' in the way that I used it in point 3 above?