Alike vs. Like

Alike is an adjective and an adverb meaning similar, like each other or in a similar way.
Use alike after nouns. Alike is not often used before nouns.

• Adults and children alike enjoy video games.
• Children and adults alike celebrate halloween in United States.

Alike can also follow other kind of words.

• No two thumb prints are exactly alike.
• My sister and I are alike in looks, but not in personality.

Like is a preposition meaning similar to. 
Use like before a noun or a pronoun to talk about similarity.

like + noun/ pronoun

• My sister talks like me.
• His daughter looks like him.
• he is a fantastic manager like his boss.

For like vs. as click on the link below:
Like vs. As