Noun

1. A telephone connection
2. A special disposition (as if from a divine source) to pursue a particular course
3. A loud utterance; often in protest or opposition
4. A demand especially in the phrase
5. The characteristic sound produced by a bird
6. A brief social visit
7. A demand by a broker that a customer deposit enough to bring his margin up to the minimum requirement
8. A demand for a show of hands in a card game
9. A request
10. An instruction that interrupts the program being executed
11. A visit in an official or professional capacity
12. (sports) the decision made by an umpire or referee
13. The option to buy a given stock (or stock index or commodity future) at a given price before a given date

Verb

1. Assign a specified (usually proper) proper name to
2. Ascribe a quality to or give a name of a common noun that reflects a quality
3. Get or try to get into communication (with someone) by telephone
4. Utter a sudden loud cry
5. Order, request, or command to come
6. Pay a brief visit
7. Call a meeting; invite or command to meet
8. Read aloud to check for omissions or absentees
9. Send a message or attempt to reach someone by radio, phone, etc.; make a signal to in order to transmit a message
10. Utter a characteristic note or cry
11. Stop or postpone because of adverse conditions, such as bad weather
12. Greet, as with a prescribed form, title, or name
13. Make a stop in a harbour
14. Demand payment of (a loan)
15. Make a demand, as for a card or a suit or a show of hands
16. Give the calls (to the dancers) for a square dance
17. Indicate a decision in regard to
18. Make a prediction about; tell in advance
19. Require the presentation of for redemption before maturation
20. Challenge (somebody) to make good on a statement; charge with or censure for an offense
21. Declare in the capacity of an umpire or referee
22. Lure by imitating the characteristic call of an animal
23. Order or request or give a command for
24. Order, summon, or request for a specific duty or activity, work, role
25. Utter in a loud voice or announce
26. Challenge the sincerity or truthfulness of
27. Consider or regard as being
28. Rouse somebody from sleep with a call