係争 （ケイソウ） dispute, contention, conflict, controversy

係留 （ケイリュウ） mooring, anchorage

連係 （レンケイ） connection, linking, linkage, link

繋ぐ （つなぐ） to connect, to link together, to tie, to fasten, to restrain, to maintain, to preserve, to keep, to transfer (phone call), to put a person through, to hedge, to buy or sell forward