As, Doors are for entry in house.
Similarly, Gates are entry in compound .

As, Hongkong is in china. Similarly, Vatican is in Rome.

As, Editor is related to Magazine. Similarly, Director is related to Drama.

As, king sits on the ' Throne' . In the same way 'Rider' sits on the Seat.

Second is recording device and first is visual device.

As, grown from of seed is Plant. Similarly, grown form of Bud is Flower.

'Pleasure' is opposite of 'Sorrow' in the same way 'Right' is Opposite of 'Wrong'.

As, sound of Nightingale is Warble. Similarly , the sound of Frog is Croak.

As, for finishing the 'Leather', Tanning, Method is used in the same way, 'Pyrotechnics' is used for 'fire works'.

MODERATE and INTENSIFY are antonyms and NOMINAL and EXPENSIVE are antonyms.