The opposite is both preposition and noun. In the case of the noun, It is used to indicates something opposite or contrary to another. In the case of the preposition, facing or across from.
- Opposite + noun
- Opposite + of + noun
As a noun: the day is the opposite of night.
As a preposition: the staff parked the car opposite the office.
Unlike is a preposition and it is used with a noun to show dissimilarity.
- Unlike + noun
- Unlike + clause: incorrect
Unlike the teacher behaved, the students showed decency: incorrect
Unlike the teacher, the students showed decency. Correct
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