Yes, line is a Scrabble word!

Verb

1. Be in line with; form a line along

2. Cover the interior of

3. Make a mark or lines on a surface

4. Mark with lines

5. Fill plentifully

6. Reinforce with fabric

Noun

1. A formation of people or things one beside another

2. A mark that is long relative to its width

3. A formation of people or things one behind another

4. A length (straight or curved) without breadth or thickness; the trace of a moving point

5. Text consisting of a row of words written across a page or computer screen

6. A single frequency (or very narrow band) of radiation in a spectrum

7. A fortified position (especially one marking the most forward position of troops)

8. A course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning

9. A conductor for transmitting electrical or optical signals or electric power

10. A connected series of events or actions or developments

11. A spatial location defined by a real or imaginary unidimensional extent

12. A slight depression in the smoothness of a surface

13. A pipe used to transport liquids or gases

14. The road consisting of railroad track and roadbed

15. A telephone connection

16. Acting in conformity

17. The descendants of one individual

18. Something (as a cord or rope) that is long and thin and flexible

19. The principal activity in your life that you do to earn money

20. In games or sports; a mark indicating positions or bounds of the playing area

21. (often plural) a means of communication or access

22. A particular kind of product or merchandise

23. A commercial organization serving as a common carrier

24. Space for one line of print (one column wide and 1/14 inch deep) used to measure advertising

25. The maximum credit that a customer is allowed

26. A succession of notes forming a distinctive sequence

27. Persuasive but insincere talk that is usually intended to deceive or impress

28. A short personal letter

29. A conceptual separation or distinction

30. Mechanical system in a factory whereby an article is conveyed through sites at which successive operations are performed on it