Homophones are words that are pronounced the same way but have different meanings. Sometimes they’re spelled identically and sometimes they aren’t. Types of homophones

Commonly confused homophones
Because they sound the same, it can be easy to get homophones mixed up and use the wrong one in your writing. Below are a few of the most commonly confused homophones in English: 
Then/than
Then is an adverb used to describe where something fits into a series of events:

• 
  We ate dinner, then we went mini-golfing.
  

Than is a conjunction or preposition used to compare two things:

• 
  My dog is bigger than his dog.
  

To/too/two
Three commonly confused English homophones are to, too, and two. 
To is a preposition, infinitive marker, or an adverb that indicates movement or that the verb being used is in the infinitive form:

• 
  They went to the mall.
  
• 
  I’d like to order a pizza.
  

Too is an adverb and can indicate that something is excessive or that something is happening in addition to another thing:

• 
  The music was way too loud.
  

• 
  My sister wanted some candy too.
  

Two is the number that falls between one and three:

• 
  So I brought my sister two packs of gummy worms.
  

There/their/they’re
Three other commonly confused English homophones are there, their, and they’re.
There is an adverb that describes a location or position:

• 
  I’m excited to visit New York again, as I haven’t been there in almost a year.
  

Their is a possessive pronoun:

• 
  The students voted for Disney World as their graduation trip.
  

They’re is a contraction of the words “they” and “are”:

• 
  The park is overrun with ducks—they’re everywhere!