Sub

2) If you can't use this method, you could substitute plan B.
Sub is very informal for "substitute."

I have not heard sub-specification, but imagine that it means a detailed point under a major heading of some "specification."

1. Without context this is meaningless.

2. You usually use "sub" (together with the word "for") as a verb in the following way: "I'm going to sub (do his job) for him while he's on vacation."

What about this?
For a lower-calorie version of the recipe, try subbing milk for cream.

The whole sentence is " the example of nuisance defects may include sub-specification geometries.

This is understandable, but "sub" is usually not used like this in English. It is generally used for a person taking the place of another person, not inanimate objects taking the place of other inanimate objects.

You're using "sub-specification" in a highly technical context. If the word is used like this in this particular context, then it would be understandable. Outside of this cont

messier42What about this?For a lower-calorie version of the recipe, try subbing milk for cream.

Informally, that is fine.