The difference between Con and Cone

Con as a verb (rare):

To study, especially in order to gain knowledge of.

Con as a verb (rare, archaic):

To know, understand, acknowledge.

Con as a noun:

A disadvantage of something, especially when contrasted with its advantages (pros).

Con as a noun (slang):

A convicted criminal, a convict.

Con as a noun (slang):

A fraud; something carried out with the intention of deceiving, usually for personal, often illegal, gain.

Con as a verb (transitive, slang):

To trick or defraud, usually for personal gain.

Con as a verb:

Con as a noun:

Con as a noun (informal):

An organized gathering such as a convention, conference or congress.

Con as a noun (informal):

The conversion of part of a building.

Con as a noun (informal, obsolete):

Consumption; pulmonary tuberculosis.

Cone as a noun (geometry):

A surface of revolution formed by rotating a segment of a line around another line that intersects the first line.

Cone as a noun (geometry):

A solid of revolution formed by rotating a triangle around one of its altitudes.

Cone as a noun (topology):

A space formed by taking the direct product of a given space with a closed interval and identifying all of one end to a point.

Cone as a noun:

Anything shaped like a cone.

Cone as a noun:

The fruit of a conifer.

Cone as a noun:

An ice cream cone.

Cone as a noun:

A traffic cone

Cone as a noun:

A unit of volume, applied solely to marijuana and only while it is in a smokable state; roughly 1.5 cubic centimetres, depending on use.

Cone as a noun:

Any of the small cone-shaped structures in the retina.

Cone as a noun (slang):

The bowl piece on a bong.

Cone as a noun (slang):

The process of smoking cannabis in a bong.

Cone as a noun (slang):

A cone-shaped cannabis joint.

Cone as a noun (slang):

A passenger on a cruise ship (so-called by employees after traffic cones, from the need to navigate around them)

Cone as a noun (category theory):

An object V together with an arrow going from V to each object of a diagram such that for any arrow A in the diagram, the pair of arrows from V which subtend A also commute with it. (Then V can be said to be the cone's vertex and the diagram which the cone subtends can be said to be its base.)

Cone as a noun:

A shell of the genus Conus, having a conical form.

Cone as a noun:

A set of formal languages with certain desirable closure properties, in particular those of the regular languages, the context-free languages and the recursively enumerable languages.

Cone as a verb (pottery):

To fashion into the shape of a cone.

Cone as a verb (frequently followed by "off"):

To segregate or delineate an area using traffic cones