- abscisin15
- abstain11
- acetin10
- acetophenetidin26
- acrasin11
- acrolein13
- actin9
- actinomycin24
- actomyosin19
- acyloin14
- adjoin17
- adrenocorticotrophin34
- adrenocorticotropin31
- aequorin19
- aflatoxin21
- again8
- agglutinin18
- agin7
- ain4
- akin9
- alanin9
- albumin16
- aldrin9
- alevin12
- alexin15
- alfaquin23
- algin9
- alizarin19
- alkalin14
- allantoin13
- allergin13
- allethrin14
- allicin13
- aloin7
- alumin12
- amain9
- amanitin13
- amidin11
- amin8
- aminopterin19
- amoxicillin27
- amoxycillin29
- ampicillin22
- amygdalin19
- amylopectin24
- amylopsin19
- anatoxin17
- anchusin16
- aneurin10
- angiotensin16
- anilin9
- anthocyanin21
- antiarin10
- antiauxin19
- antiglobulin22
- antimycin19
- antithrombin22
- antitoxin18
- antivenin16
- antivitamin20
- apolipoprotein25
- appertain16
- arshin9
- ascertain13
- aspirin11
- assassin9
- atropin11
- attain7
- atwain10
- auxin14
- avidin12
- ayin7
- bacitracin20
- backspin22
- bacterin15
- bacteriocin21
- bacteriorhodopsin30
- baldachin20
- bargain13
- basin9
- baudekin18
- bearskin16
- bedouin13
- beduin12
- begin11
- benjamin25
- benzidin23
- benzin20
- benzoin21
- berberin15
- berlin11
- betweenbrain23
- biffin16
- biggin14
- bilirubin18
- biliverdin20
- bin7
- biotin10
- biotoxin19
- birdbrain17