The 16 words below may be separated into 4 groups.
Additionally, there is a word absent from the wall which can be placed in all four of those groups.
DANCE | ENTER | ESCAPE | HEROES |
INSERT | JACKAL | LETTER | LOW |
MARRIAGE | NETWORK | PARKING | RETURN |
SEASON | SOURCE | TENT | TONIGHT |
Can you identify the four groups?
What new word can be placed in all four of those groups?