Inflection of some nouns

[Vāvere]

I have collected some words whose complete inflection could not be found in the dictionaries I have available. I would like to get an answer to the following questions: Are the words masculine or feminine? How do they decline in the genitive plural? What do they mean?

bārksts
bikts
drāts
dzirksts
guns
ģikts
ilkss
izkapts
laputs
nīts
olekts
pāksts
palts
pults
rūts
skrots
smilts
spīts
tāss
vakts
vants
versts

[Sol Invictus]

bārksts - f, bārkstu, fringe
bikts - confession (as in church), it's an archaism usualy used in expressions, I'll refrain from making guesses about its gender and plural genitive, never heard it being used in another form than singular nominative
drāts - f, drāšu, wire
dzirksts - f, dzirkšu, sparkle
guns - f, guņu, fire, light (especialy poeticaly, it derives from uguns)
ģikts - f, singular only, podagra
ilkss - f, ilkšu, thill
izkapts - f, izkapšu, scythe
laputs - f, laputu, plant louse
nīts - I don't know what it is dictionary says its masculine, translates as heald
olekts - f, olekšu, ancient unit of lenght (translated as cubit or ell)
pāksts - f, pākšu, pod (such as peas have)
palts - f, palšu, large puddle
pults - f, pulšu, can have several meanings - type of desk, remote control, control panel of some machinery
rūts - f, rūšu, windowpane
skrots - f, skrošu, type of ammunition, usualy used for hunting, as far as I know it is very small and round
smilts - f, smilšu, sand
spīts - m, singular only, spite
tāss - f, tāšu, birch bark
vakts - f, vakšu, watch
vants - f, vanšu, cable used on sailing ships or in suspension bridges
versts - f, verstu, ancient unit of lenght

[Vāvere]

Thank you for your help. One more question on this subject: What is the genitive plural of avs ’sheep’?

[Sol Invictus]

avju