連携【れんけい】
cooperation, coordination, link
提携【ていけい】
cooperation, tie-up, joint business, partnership, alliance, sponsorship
携帯【けいたい】
carrying (on one's person or in the hand), mobile phone, cell phone
携わる【たずさわる】
to engage in, to participate in, to take part in, to be involved in
携える【たずさえる】
to carry in one's hand, to carry with one, to have on one's person, to bear, to take along (someone), to take (someone) with one, to be accompanied by
必携【ひっけい】
handbook, manual, vade mecum, essential item, must-have