対す

1. godan verb, intransitive to face (each other); to be facing
2. to be directed toward (the future, etc.); to be in response to; to be related to
3. to receive (a client, etc.)
4. to compare with; to contrast with; to be in opposition with; to be opposed to
5. to confront; to oppose; to compete with

ついす

1. godan verb, intransitive, archaic to form a pair; to correspond