Name for words that are counterparts to each other in some context but not antonyms?

Question

What is the name for words that are contrasting counterparts or near opposites to each other in some context, but are not generally strict antonyms?

Some examples with word1 word2 (example context):

• boys girls (sex or gender roles)
• man machine (discussion of technological division of labor)
• data control (standard digital hardware architecture)
• plants animals (high-school level cellular biology)
• shoes socks (standard layers of footwear)
• weapons armor (two distinct types of equipment in a game)

Answer 1

These are referred to as collocations. A nice informal definition:

A collocation is two or more words that often go together. These combinations just sound "right" to native English speakers, who use them all the time.

Wikipedia has a much weightier take on the subject.