Cases of word usage

1) complement each other; have a relationship (correlate)

2) the scientific study of the relationship between workers and their environment (ergonomics)

3) friendly relationship (fellowship)

4) a placing of the feet; surface for standing on; a (mentioned) relationship (with people) (footing)

5) (an instance, period, of) the feeling or relationship that exists between friends (friendship)

6) to change the ending or form of (a word) to show its relationship to other words in a sentence; to adapt, regulate (the voice); (of a line etc) to bend inwards; curve (inflect)

7) a relationship by blood (kinship)

8) a working association between two or more people, committee etc; a sexual relationship between unmarried people (liaison)

9) a person who is having a (sexual) relationship with another person (lover)