Simple categories matching straight:

• device,
• object,
• part,
• stick,
• line,
• connector,
• wood,
• weapon,
• pin,
• side,
• structure,
• surface,
• fertilizer,
• path,
• member,
• road,
• form,
• piece,
• tube,
• plate,
• edge,
• material,
• limb,
• tree,
• blade,
• tool,
• bar,
• stock,
• conductor,
• abrasive,
• wall,
• activity,
• thing,
• vessel,
• seam,

Members with property straight:

• straw,
• roof_ridge,
• door_frame,
• beam,
• soda_straw,
• shell,
• ruler,
• urea,
• long_ruler,
• road,
• highway,
• row,
• femoral_vessel,
• pencil,
• rectangle_table,
• mono_ammonium,
• sword,
• screwdriver,
• quilting_pin,
• cherry,
• rod,
• wall_edge,
• back_seam,
• steel_beam,
• axis,
• basic_line,
• horizontal_line,
• square,
• support_mast,
• door_threshold,
• ribbon_holder,
• knife,
• utility_pole,
• tube_stock,
• round_shovel,
• tongue_blade,
• glass,
• potash,
• rail,
• stick,
• railroad,
• sharp_chisel,
• insulation_plate,
• panel_border,
• high_way,
• lower_leg,
• dowel_rod,
• nose,
• stair,
• current_war,
• sidewalk_crack,
• doorway,
• wisconsin_blade,
• storage_compartment,
• gun,
• granite_bar,
• cube,
• bar,
• parabola,
• pine,
• stair_tread,
• board_mark,
• sidewalk,
• building,
• place,
• building_edge,
• bow,
• nail,
• dual_carriageway,
• arterial_road,
• twig,
• ditch,
• rectangular_container,
• motorway,
• ammonium_sulfate,
• garden_edge,
• airport_lane,
• path,
• paint_stick,
• triangle,
• edge,
• fence_post,
• phosphate,
• vent,
• plank,
• tool_handle,
• curb,
• box,
• train_track,
• pillar,
• star_shape,
• windows,
• fluorescent_tube,
• asparagus,
• flagpole,
• driveway_edge,
• metal_straightedge,
• slide-projector_light,
• branch,
• miller_blade,
• microtubule,
• ash,
• diagonal_line,
• railway_track,
• lance,
• string_stretch,
• bolt,
• leg,
• shaft,
• window-blind_cord,
• asphalt,
• regular_polygon,
• face_plate,
• rhombus,
• heptagon,
• line,
• border,
• diamond,
• optical_axis,
• hexagon,
• pentagon,
• fence_picket,
• mountain_path,
• sausage_tree,
• field_boundary,
• arm,
• weight_bar,
• plate,
• irregular_line,
• metal_rod,
• side,
• ammonium_sulphate,
• fence,
• steel,
• vertical_line,
• concrete,
• rutted_road,
• maple,
• construction,
• wall,
• spear,
• telephone-pole_start,
• ammonium_nitrate,
• wire,
• craft_stick,
• white_line,
• yardstick,
• basilar_artery,
• dipole,
• board,
• club,
• house,
• freeway,
• star,
• polygon,
• poplar,
• horizon,
• walking_stick,
• birch,
• diamond_shape,
• tangent,
• lower_arm,
• column,
• ball,
• king_road,
• door_jam,
• ammonium_phosphate,
• text,
• aorta,
• window,
• flat_chisel,
• thin_rod,
• post,
• sign_post,
• carpenter_square,
• corner,
• creek,
• rectangle,
• oak,