“GAINGIVING” is a valid word.

gainingobtain
naggingcontinually complaining or faultfinding
gangingact as an organized group
gingivathe tissue (covered by mucous membrane) of the jaws that surrounds the bases of the teeth

gangan association of criminals
gaina quantity that is added
vaincharacteristic of false pride; having an exaggerated sense of self-importance
vina
agin
giga
vang
vagia mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera
viga
inia

ainbelonging to or on behalf of a specified person (especially yourself); preceded by a possessive
vanany creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts)
giglong and light rowing boat; especially for racing
inna hotel providing overnight lodging for travelers
ginstrong liquor flavored with juniper berries
via
nanyour grandmother
gaga humorous anecdote or remark intended to provoke laughter
nagsomeone (especially a woman) who annoys people by constantly finding fault
ganseparate the seeds from (cotton) with a cotton gin
aniblack tropical American cuckoo
vig

ina unit of length equal to one twelfth of a foot
anan associate degree in nursing
naa silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)
aian agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders
aga soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography

GAINGIVING