Firstly your way of generating an ID for table2 is wrong. Use an
IDENTITY[
^] column to automatically create that ID for you.
Secondly, you are only assigning those variables once, which is why it only inserts a single record, you need to select the entire deleted table.
For example (NB this assumes that you are using an identity column for table2.Reject_id
CREATE TRIGGER trgInsRejctWrd
ON table1 AFTER DELETE
AS
insert into table2
VALUES(Suggest_SourceWord, GETDATE(), Suggest_WordDiff)
from deleted