Modifiers matching oxygen:

• bound,
• dissolved,
• molecular,
• pure,
• elemental,
• atomic,
• abundant,
• free,
• active,

Simple categories matching molecular:

• machine,
• system,
• cloud,
• food,
• property,
• gas,
• reaction,
• displacement,
• event,
• change,
• movement,
• scale,
• solvent,
• entity,
• process,
• quantity,
• physics,
• solid,
• cause,
• fluid,
• device,
• assembly,
• structure,
• carbon,
• analysis,
• force,
• substance,
• component,
• geometry,
• characteristic,
• oxygen,
• thing,
• compound,
• aldehyde,
• science,
• discipline,
• concentration,
• container,
• alteration,
• approach,
• halogen,
• imaging,
• parameter,
• response,
• technology,
• hydride,
• macromolecule,
• topology,
• data,
• variable,
• skeleton,
• level,
• state,
• weight,
• bioscience,
• investigation,
• chain,
• architecture,
• work,
• adaptation,
• aspect,
• hydrocarbon,
• trait,
• space,
• atmosphere,
• laser,
• landmark,
• medicine,
• selectivity,
• polymer,
• measurement,
• carbohydrate,
• line,
• contamination,
• substrate,
• ion,
• signal,
• chains,
• form,
• study,
• reorientation,
• rest,
• modification,
• information,
• barrier,
• unit,
• phosphorus,
• composition,
• complex,
• adduct,
• phenomenon,
• factor,
• mechanism,
• carbonyl,
• evolution,
• research,
• group,
• size,
• energy,
• feature,
• material,
• function,
• trap,
• machinery,
• precursor,
• surface,
• transformation,
• formation,
• condition,
• marker,
• behavior,
• alcohol,
• protein,
• gel,
• carrier,
• transport,
• repair,
• attribute,
• interaction,
• crystal,
• shape,
• activity,
• aggregate,
• film,
• therapy,
• fragment,
• constituent,
• layer,
• concept,
• contaminant,
• fiber,
• solution,
• solute,
• constant,
• terms,
• liquid,
• motion,
• nutrition,
• track,
• project,
• particle,
• mixture,
• parasite,
• medium,
• biology,