Strategy –a planned series of actions for achieving something
E: The government carries out a long-term economic strategy

Modification –a small change made in something such as a design, plan, or system
E: We've made one or two modifications to the original design.

Definitely –without any doubt
E: She views very definitely.

Mainstream –the most usual ideas or methods, or the people who have these ideas or methods
E: Environmental ideas have been absorbed into the mainstream of European politics.

Cellulose –the material that the cell walls of plants are made of and that is used to make plastics, paper etc
E: We should eat more green vegetables rich in cellulose.

Replacement –when you get something that is newer or better than the one you had before:
E: Our old car is badly in need of replacement.

Scenario –a situation that could possibly happen
E: It looked ominously like we were about to repeat the earlier scenario.

Virtually –almost
E: Virtually all the members were in agreement with the proposal.

Interchangeable –things that are interchangeable can be used instead of each other
E: These two words are almost interchangeable.

Monoxide –carbon monoxide: a poisonous gas produced when carbon, especially in petrol, burns in a small amount of air
E: motor vehicles give off carbon monoxide.

Perspective –a way of thinking about something, especially one which is influenced by the type of person you are or by your experiences
E: You must get the story in its right perspectives.

Conventional –a conventional method, product, practice etc has been used for a long time and is considered the usual type
E: Internet connections through conventional phone lines are fairly slow.

Yield –the amount of profits, crops etc that something produces
E: These trees gave a high yield of fruit this year.

Carbon –a chemical substance that exists in a pure form as diamonds, graphite etc, or in an impure form as coal, petrol etc. It is a chemical element: symbol C
E: I make a carbon copy of my essay.

Variant – something that is slightly different from the usual form of something
E: The story has many variants.