Camp: /kæmp/ v. n.

Campus: /ˈkæmpəs/v. n.

Campaign: /kæmˈpeɪn/v. n.

We camped by the lake for the weekend. 

Camp:

The campsite was located in a beautiful area. 

We camped out under the stars for the night. 

camping

 noun

/ˈkæmpɪŋ/

 Weset up camp by the river. 

We'regoing camping in the mountains this weekend. 

Campus:

The campus was full of students rushing to and from classes.

I like to campus around the university on weekends. 

Campaign:

 The presidential campaign was full of speeches and debates. 

The organization campaigned for climate change.