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Co
Col
Com
Con
Syn
100
To exist at the same time or in the same place.
Coexist 
100

To labor together 

Collaborate
100
 Made of separate parts or elements 

Composite

100
An agreement or harmony

Concordance

100
Elements on both sides of a line that have the same shape, size and arrangement 

Symmetry

200
Sticking together; Connected related in some way
Coherent 
200
To come together with great force; to clash
Collide 
200
 Bring together; a mixture 

Compound

200
To gather together 
Congregate
200
To form a new thing by combining parts from other things; to unite or merge
Synthesize