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com- [co-, cog-, col-, con-, cor-] (Latin: together, with; used as a prefix).


combat:
combatant:
combination:
combine:
combustible:
combustion:
commemorate:
commit:
compact:
companion:
companionable:
company:
comparison:
compassion:
compatible:
compile:
complete:
component:
comport:
compose:
The prefix com- is assimilated to co- before h, w, and all vowels:

coagulate:
coeducation:
coequate:
coerce:
coeternal:
coexist:
cohabitation:
coherence:
cohesion:
The prefix com- becomes, cog- before g:

cogent:
cogitate:
cognition, et al.

The prefix com- becomes, col- before l:

collate:
collateral:
colleague:
collect:
colloquial, et al.

The prefix com- becomes, con- before c, d, g, j, n, q, s, t, v:

conceal:
conceive:
concentrate:
concert:
condominium:
conduct:
conductor:
constancy:
constant:
constellation:
contract:
contraction:
convoluted:
covivant, et al.

The prefix com- becomes, cor- before r:

correct:
correct:
correlate:
correlate:
correspond:
corrigible:
corrigible, et al.