1. Other
Others
Another

2. To mean : additional or further
Other
Used as an adjective
Before plural noun
To mean : additional or further
Example : Many scientists feel that global warming can be reversed other scientists disagree.

3. To mean : additional or other persons or things
Others
Used a pronoun
To mean : additional or other persons or things
Example : Many scientists feel that global warming can be reversed others disagree.

4. Used as an adjective Used a pronoun
Another
Only used with singular noun
Used as an adjective
Used a pronoun
To mean : alternative to something previously considered
To mean : an additional one of the same kind
Example : I know you want to go to Mexico on vacation , but I have another idea.
Example : That was a good cup of tea . I think I’ll have another .

5. Emphatic Do  Used as an auxiliary Negative Question Simple present
Simple past
 It can be used before the inventive in affirmative sentence to add a special emphasis