The German word is Vater (pronounced "farter")
You type the keys and make a word.
, belief, abstraction, brainstorm*, clue, concept, conception, conclusion, conviction, design, doctrine, end, essence, estimate, fancy, feeling, flash*, form, guess, hint, hypothesis, import,...
Ideas is already plural. The singular is idea.
The word is "interject", and it is from the Latin words inter, "among", and jactus "thrown".