good, high, huge, large
low
adequate
declining, dwindling, falling
declining fish stocks in the oceans

surplus
buffer, reserve
A buffer stock of grain was held in case of emergency shortages.

fresh, new
old
existing
breeding, fish, food, oil, etc.
film
housing (esp. BrE)
The housing stock is no longer large enough for the population.

capital, money
rolling (BrE)
The rail company is investing in new rolling stock.

carry, have, hold, keep
The big supermarkets carry huge stocks of most goods.

add to, increase
get rid of, reduce
They're getting rid of their old stock.

maintain, protect
laws to protect fish stocks

replace, replenish

be up, increase
be down, decline, dwindle, run low
Stocks of coal are running dangerously low.

last
The offer is only available while stocks last.

room (usually stockroom)
levels
control (esp. BrE)

from stock
We can supply the table from stock.

in stock
Do you have futon beds in stock or will I have to order one?

out of stock
Red tights are out of stock.

company
growth
domestic, foreign
common, dividend-paying, preferred, restricted
traded
publicly traded stock

energy, financial, gold, high-tech, Internet, technology, etc.
tracking

acquire, buy, invest in, purchase
cash in, dispose of, sell
deal in, trade
have, hold, own
issue
value
The stocks were valued at $100 000.

be down, be up
drop, fall, go down, plummet, plunge, sink
go up, rally, rise, soar
hit sth, reach sth
The company's stock hit an all-time high of $94.66.

exchange, market
price
fund
index
option

in stocks
She has about $30 000 in stocks.

investment in stocks
stocks and bonds (AmE), stocks and shares (BrE)
the price of the stocks, the value of the stocks
The total value of the stocks was over $3 million.

beef, chicken, fish, vegetable, etc.

make
dilute, reduce
flavour/flavor
You can flavour/flavor the stock with bay leaves.

cube

in a/the stock
Poach the fish in the stock.