取材【しゅざい】
gathering material (for an article, novel, etc.), collecting information, covering (an event, incident, etc.), reporting, interview (for a news story)
材料【ざいりょう】
materials, ingredients, material (for a novel, experiment, etc.), subject matter, grounds (for a decision, judgement, etc.), basis, evidence, data, (market) factor
素材【そざい】
ingredient, (raw) material, resource, unprocessed timber, raw timber, subject matter, topic
人材【じんざい】
capable person, talented person, human resources, personnel
木材【もくざい】
lumber, timber, wood
教材【きょうざい】
teaching materials
題材【だいざい】
subject, theme
材木【ざいもく】
wood (for building), lumber, timber