चुनचुनी  =  feeling
She had a slight tickle in her throat (= that made her want to cough).

गुदगुदी  =  act
She gave the child a little tickle.

हल्के से छूना
The grass tickled her calves.

जगाना
To tickle somebody's imagination / curiosity / sense of humour

चुनचुनी करना
His beard was tickling her cheek.

गुदगुदी करना
The mother tickled the baby playfully.

गुदगुदाना
The bigger girls used to chase me and tickle me. / i tickled his feet with a feather.